Mugo Pine Sherwood Compact

this question was addressed several times in the forum. What is best/safest to do first. Style or repot?
The needles do not seem too congested from your photo. Air circulation is critical to avoid fungal disease.
Mugo pine trees are susceptible to two fungal diseases that cause browning at the ends of branches, including dothistroma needle blight, which causes branches and needles to turn reddish brown, often beginning at the lower portions of the mugo pine tree. Sphaeropsis tip blight causes mugo pine branches to turn brown at the ends, in addition to causing the formation of cankers along the branches, which sometimes girdle and kill the branches. Fungicides and good cultural care help control fungal diseases.

Over fertilizing can also cause browning from too much salt stealing the moisture from the fine roots.
What is good cultural care?
Wiring the branches to allow more sunlight into the interior and to ensure sustainable health to the tree can help as cultural care to keep it healthy, but you may want to avoid heavy bends this late in the season. Because the risk of damage is greater in the spring you must be gentle if you attempt any wiring.
addressed in the forum… Wiring in Spring v. Fall
If you can safely remove it to inspect if it is root bound, that will improve your knowledge of how to keep it healthy. Fertilizing in the spring will help with care not to over fertilize. Let the pot dry to the point of feeling light before watering. Then water thoroughly.
Nice find! I use the search feature in the forum to look for prior discussions. But, I always take the advice as worth the price! So research any advise for yourself and you will gain confidence in your knowledge and skill level.
Have fun, learn lots, share with others.

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