TempPro TP49 Digital Hygrometer Indoor Thermometer Humidity Meter Room Thermometer with Temperature and Humidity Monitor Mini Hygrometer Outdoor Thermometer (Previously ThermoPro)

First, get a meter. They're cheap. See https://www.amazon.com/dp/B07WCR5Y4B?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_1 or other sources. Ideal is 45-55%. 5% either side of that I wouldn't worry. If it's much wetter or dryer you may want a humidifier or dehumidifier depending. Where I am (Northern California) it runs 45-55 all year, so I'm lucky.