Jupiter, considered the planet of wisdom and fortune, is in a debilitated state when placed in the 4th house for lagna Libra. As Jupiter governs not only the 4th house but also the 3rd and 6th houses, this placement may have an impact on these houses as well.
When Jupiter is placed in the 4th house for Libra ascendant, it influences one's domestic life. This placement suggests that an individual would have a strong desire to invest in their home’s comfort and luxury. However, they may fail to achieve it due to financial problems as Jupiter's debilitation indicates a lack of contentment leading to dissatisfaction with one's accomplishments.
On the bright side, Jupiter being natural karaka of houses like [2,5,9], would take care of such houses leading to successful investments or positive developments in financial matters. Additionally, it also makes one inclined towards religious and spiritual practices.
Considering that Jupiter aspects the 8th house of secrets and transformation, individuals with this placement may prefer maintaining privacy or solitude for introspection purposes which eventually leads them to transform themselves to become better individuals.
Moreover, When Jupiter aspects the 10th house gives direction regarding career and professional life as [10] is responsible for our achievement or recognition at work/profession front. With this placement, natives can expect luck and fortune while pursuing their professional interests with sincerity and hard work leading to promotion at workfront.
As Jupiter also aspects the 12th house of losses/ expenses making individuals good at managing their expenses and giving them a sense of storing wealth from an early age.
However , natives must be careful about overspending as aspecting (drishti) does not mean that abundance will always come through expenditures as there needs to be balance between saving & spending habits.
In conclusion -
Jupiter's placement in the 4th house for lagna Libra brings a mix of results. While on one hand, it can positively impact financial investments and success, Jupiter’s debilitation suggests caution in matters related to contentment and satisfaction leading to expenses beyond one's capacity. Additionally, individuals with this placement are likely to focus on their spirituality and transform from within. Hence, this placement hints at the need for balance in one's personal and professional life.