Meme coin are currently making waves but that does not mean they are solid project to allocate your money into. The meme are just been hyped which means it is a 50/50 chance and the risk of getting dumped on is very high. Project like dot should be given attention as they have very high chances of increasing in price.
If you can not afford dot then buying some coins in the ecosystem would be good as they too will benefit from the money that will be flowing into the ecosystem. Polkadot is a very good alternate ethereum and should be getting some recognition very soon just as Solana and others are receiving.
I would rather invest in multiple coins, I'd say invest in a memecoin such as SHIB but with a small value, gain small profit, if not, then you have other options, I agree that Polkadot is quite underrated, I'm looking forward to actually invest in Solana and definitely Ethereum this upcoming alt season.