Small Aircraft
Flight Crew Instrument
Communication Breakdown; Other / Unknown; Situational Awareness
ATC Issue All Types; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Provided Assistance; Flight Crew Executed Go Around / Missed Approach
Environment - Non Weather Related; Human Factors
Having not been airborne in a couple of months; I decided some instrument approach practice was a good idea in VMC. My initial plan was an RNAV approach at ZZZ. But a late airplane switch put me in an airplane with only ILS capability so I decided to do the ILS approach at ZZZ1. This put me in busy ZZZ2 airspace. While practicing an ILS approach to ZZZ1 under the hood; ZZZ2 Approach was very busy. I set up the radio for ZZZ1 Tower in the secondary and double checked it per the approach chart. When handed over to ZZZ1 Tower; I switched the frequency and called the Tower with my position. I then was very busy keeping the needles centered. The air was a bit bumpy and I had not been flying since the COVID-19 outbreak so was very busy and focused. I was doing an OK job with the navigation but didn't have much bandwidth for anything but the needles and pre-landing checks.When I didn't hear from Tower I thought it was odd but I was busy so just called for a low approach. After the go-around; I came back up on Approach frequency and the Controller said I had not contacted the Tower. I said I called them. Then I checked the frequency again. I had set .0X instead of .X. I had even checked it 3 times before the switch and again at the switch and didn't catch the error. The second error was not confirming contact with the Tower and confirming landing clearance. Since the Approach Controller was very busy I cancelled approach practice and did some VFR landing practice. I need practice and will take an instructor with me next flight.
Pilot reported being switched from Approach to Tower; but dialed incorrect frequency resulting in a go-around.