Any alt coin suggestion expect ada.In my point of view of ada still can't surpass ETH in the smart contract field and even if they can make it will be hard to be replace existing eth smart contract eco system.Moreover late coming project like sol even surpassing to ada,all things ada have is the loyal user base and nothing special things in tech
Ada and eth both are potential and there is a big chance to pump the price. Investment on eth and ada are risk free (less risk than others). Besides, you can go for bnb and it's growing so fast at this time. I hope it'll be rising continuously in future.