Hello,

1) Please try and use the following Class in the Custom Selector of Advanced Typography Settings.

".widget_price_filter .price_slider_amount .price_label>span"

".woodmart-woocommerce-layered-nav .layer-term-name"

2) For the timer font size try using the following Class.

".wd-product-countdown.wd-timer span"

Regards.
Xtemos Studios