I did have what most would consider to be a large sum of money a few months ago, and I did dump it into a taxable account (all retirement accounts being already maxed) without so much as a pause.
It's what I do when I have money to invest. As a non-market timer, I give zero thought to what the market is doing at that moment. Zero. Truly, absolutely none.
It might help if you had a Personal Investment Statement, or whatever it is we are calling those. Then, when things like this come up, you don't have to make a decision. You've already made that decision for yourself when the stakes felt much lower. Mine says that when I have extra cash (which for me is defined as a balance in the checking account over $X at the low point in the month), I invest it according to my pre-determined allocation. Easy peasy. No angst, no second guessing. Have a plan, follow it, and don't even look at what the market is doing while you are executing it because you know and truly accept that you should not and can not [effectively] time the market.