Started ME1 end game and can't go back

Bruh I didn't realise Ilos started the end game. The main story was so good and captivating I was leaving most the side missions until later on in the game. I didn't realise Ills would be the final mission and I haven't got a save that's less than 2 hours ago :(

Im really enjoying it and wanted to play as much as possible. I've only played like 10 h and I feel like there must be loads more to do. Defo 2+3 I'll play much slower