Sitting in God's presence has always been really hard for me. My brain seems like it has to be doing multiple things at a time wether it's fidgeting or listening to music while I do homework, so for me when I try to sit down at with God I have a hard time. My mind will wander then I'll pull it back to God but the moment I stop forcing myself to think about God it will wander again so I have to make a conscious effort to sit in God's presence. Then I have a hard time because I overthink everything that comes in to my head and wonder how much of what my time with God is really just me making stuff up. One thing that's always helped me is imagining a giant throne with light radiating off from it. I highly doubt that's really what Heaven is going to look like but it reminds me who is king and helps me focus on God without closing myself off to hearing anything from Him. Another things that helps me get closer to God is praying out loud. When I say that I mean talking at my regular volume to God about whatever comes to my head to talk to Him about.