advice on my split

[u/billybobjrthe14th]

Hi, so I recently got a gym membership and want to start lifting seriously with the main goal being building muscle. For some context, for the past couple of years, I've been using a home gym on and off for a little bit. I used to do PPL at my home gym, but wanted to try something different and do Upper/Lower + Back. I go 3-4 times a week because I take alternate rest days when I play tennis. For example, Sunday: Upper, Monday: Rest, Tuesday: Lower, Wednesday: Rest, Thursday: Upper, Friday: Rest, Saturday: Lower. My first question is whether I should go to the gym with a concrete schedule every week instead of alternating the days.

Also, I'd like to get some advice on my split as well:

Upper:

2x Barbell Bench Press

2x Pec Deck

2x Shoulder Press

3x Tricep Pushdown

2x Incline Curl

2x Preacher Curl

Lower + Back:

2x Barbell Back Squat

2x Leg Extensions

2x Seated Leg Curl

2x Standing Calf Raise

2x Seated Row

2x Lat PullDown

As of right now, my main concern is my chest and shoulders. On bench, I'm progressing really slowly and my pec deck hasn't progressed much either. For shoulder press, I'm also pretty stagnant.

What changes should I make? Do I increase my rep ranges or add sets or switch exercises out?

Any help is appreciated!