If you have that many problems, you should change it for sure. However, I don't think the best option you can choose is to DIY it, you can miss a single detail, and the whole project is ruined, which will make you lose a lot of time and money. I've always been informing myself from
https://www.sumppumpadvisor.com, and I can truly recommend you these guys. They have a lot of free information that will be useful for you and also, they have a lot of models described at different price ranges. In this way, you can get the best option for you under your budget.