Your current lowest gear is 22/36 = 0.61 x wheel size. To match that with a 46T cassette you’d need a 0.61 x 46 ~ 28T chainring. A 30T chainring instead will mean you have a lowest gear a bit less than 10% harder than your current lowest gear.
Your current highest gear is 36/11 – to match this you’d obviously need a 36T chainring. So with a 30T you’d be losing more like 20% off the highest gear on the bike.
Current range is 36/11 to 22/36 ~ 535%. 11-46 has a 418% range. Whether you lose that mostly from the top end or mostly from the bottom end depends on whether you go 30, 32 or 34T. 32T will mean you lose roughly equal amounts top and bottom.