I've been looking to invest in some rising altcoins for quite a while now. Any suggestions for temporary investment? 
If you want to invest both short and long term, you can choose BNB. BNB is very active at the moment for day trading. Each price change reaches $ 50.
Or you can select coins that were recently listed to the exchange. There is a high probability that it will increase sharply for some time, and will drop again.
Now all DeFi exchanges are popular and their tokens continue to grow in price, but for all DeFi exchanges liquidity is necessary. It is good that exists such pools like https://safespacecrypto.net/ that increase the liquidity of DEX.
The most important thing for every DeFi exchange is liquidity. From liquidity depends how many traders use the DeFi exchange, that is why liquidity pools like https://safespacecrypto.net/ are very popular and the price of their tokens continue to grow.