Some of the other posts are correct that it would be good to know your age and overall time horizon with this money. That being said, here's some general ideas:
1) Put aside a chunk of it for two things:
a) 3-6 months of expenses (your emergency fund). More towards three months if you have a spouse or partner that also has income that can support you, more towards 6 months if you are your only source of income.
b) Put aside enough cash in addition to the 3-6 months to cover any major expenses you foresee in the next 3-5 years. This might be a car, a down payment on a house, a home repair, etc. If you'd be happy with 3%, no sense in investing a chunk of money that you'll only end up turning around and borrowing for at 3+% in a short amount of time.
2) Take advantage of tax-advantaged accounts. If you are in a lower tax bracket now than you anticipate you might be in when you take out the money, opt for a Roth IRA. If you're in a higher bracket, opt for a Traditional IRA. The Roth IRA will give you more liquidity, as you can take out any dollars that you contribute tax and penalty free (unlike many other retirement accounts.). Being that it's close to the end of the year, you can get in $6,000 for 2019 if you contribute prior to April 15, and another $6,000 for 2020. Max the accounts for your spouse as well if you're married.
3) If you have a HDHP for your health insurance, then open an HSA and max that as well ($3,500 max for 2019 for individuals).
4) You might even consider maxing out your 401(k) for the foreseeable future and instead treating this $100k as your "paycheck" for a while.
5) Any excess should probably just go into a taxable investment account. Open one on Robinhood, Charles Schwab, Vanguard, or any other broker with low fees. Any investments in this taxable account should be in ETF's rather than mutual funds. The two are very similar (both baskets of stocks and/or bonds), but ETF's are much more tax efficient as they don't distribute capital gain distributions nearly as often as mutual funds would. Despite the fact that you have a low risk tolerance, it's still wise to invest at least 30-40% of your account in stocks. By adding at least this amount of stock ETF's to your account you could actually lower the amount of volatility in your account while increasing your expected return (as opposed to investing in 100% bonds). As for the other 60-70%, you might consider a mix of government bonds (especially Treasury inflation protected securities (TIPS)), REITs, and a solid all bond market ETF. One other option for the "conservative" portion of this account would be what's called "buffered" ETF's. They allow you to participate in the market up to a cap (usually 8-12%), while protecting you from a certain amount of downside risk (see here:
http://www.innovatoretfs.com/define/
). For someone as conservative as you, these funds give you the potential upside that you're looking for (and more), plus protection from drawdowns.
6) Go see an independent financial advisor (preferably one with their CFP designation). Pay them a flat fee to give you advice on what to do with this money, as well as create a plan that makes sense of the rest of your financial life.