I hear you on chasing the protein as a vegetarian. It’s definitely an intentional choice and when you combine trying to lose weight with limiting calories, it makes it even harder to skew towards more protein. There’s this thread that had a lot of tips: Vegetarians/Vegans how are you getting 1.5g/kg of protein per day?
Greek yogurt, as mentioned here, has a lot of protein for the calories.
Seitan and tempeh are also other plant-based options for protein.
I take a couple of different protein supplements (one’s a powder and the other a pre-made shake) a day to try to keep up but it’s very easy to get off track.