Pooling transactions to save gas

Several months ago when gas bottomed out, I made several little DeFi investments. Most are now worth substantially more, but gas has gotten to the point that nearly all the profit would be eaten by simply withdrawing.

From my admittedly narrow understanding of smart contracts, it seems it would be possible to have one that simply pools slippage-tolerant transactions until the number built up and/or the gas price gets to a point that a single transaction for a higher value can be ran and the cost for it distributed as a percentage. Does something like this exist?

It may be that simply interacting with the contract would be too costly to make this work, but maybe someone has also figured out how to get around that issue? The obvious solution is just having one big wallet out there and having faith in the holder of that wallet to do what is being asked but... I'd prefer literally any other option.